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电网技术  2014 

基于MMC的高压直流三极输电技术

DOI: 10.13335/j.1000-3673.pst.2014.04.003, PP. 838-843

Keywords: 五电平子模块,模块化多电平换流器,柔性直流输电,高压直流三极输电,交直流转换,电流调制

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Abstract:

在借鉴传统高压直流三极输电和模块化多电平换流器型直流输电(modularmultilevelconverterbasedhighvoltagedirectcurrent,MMC-HVDC)的基础上,提出基于MMC的高压直流三极输电技术。该技术采用五电平子模块来满足极3直流电压极性和直流电流方向周期性变化的要求。首先分析了五电平子模块的工作模式和闭锁后故障等值电路,而后分析了基于MMC的高压直流三极输电的电流调制策略,设计了MMC相应的控制策略。最后基于PSCAD/EMTDC搭建了基于MMC的高压直流三极输电系统,仿真算例结果验证了该系统的可行性。

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